EF9345 datasheet(31/38 Pages) STMICROELECTRONICS

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D, Y

B, X

KRC Command

D district

number

B (even)

B + 1 (odd)

Figure 31 : KRC Command : Sequential Access to Short Codes

6543

210

b1 X5 X4 X3 X2 X1 X0 b0

CHARACTER POSITION (0 to 79)

6543

210

b1 X5 X4 X3 X2 X1 X0

X = (0 to 39)

Block parity

Rotate right

Figure 32 : Transcoding an Horizontal Screen Location into a R7 Pointer

BM GM R M

D= 1

D = 0

C M

DOR

MAT

Background

Color

Foreground

Color

The pixel shift frequency is f

CLK (12MHz)

Figure 33

Displaying the Attributes - DOR Register

Short code and mosaïc characters are not flashing,

not underlined and ”positive”.

The attributesare processed in the following order :

- Underline or underlined cursor : foreground is

forced on the last slice (NT = 9).

- Flash : background is periodically (0.5Hz - 50%)

forced on all the window. The phase depends on

the negative attribute.

- Color select : a ”positive” character is displayed

with a background color same as the margin

color. The foreground color is selected in DOR

- Negative : when the character is negative, back-

ground and foreground colors are exchanged. In

complemented CURSOR position, these colors

are complemented.

- Insert : the D attribute selects one insert value in

DOR register. This attribute is then processed up

to the current insertion mode (see screen format

and attribute insert section.

EF9345

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